<div class="error">
</div>
<div>
    <form method="post" action="<?= url('login', 'process') ?>">
        DNI del Titular <input type="password" name="dni_titular"><br/>
        DNI del Solicitante <input type="password" name="dni_solicitante"><br/>

        Fecha de naciemiento del titular:
        <?= select_numbers(1, 31, false, $html_attr = array('id' => 'day', 'name' => 'day')); ?>    
        <?= select_numbers(1, 12, false, $html_attr = array('id' => 'month', 'name' => 'month')); ?>    
        <?= select_numbers(intval(date('Y')) - 100, intval(date('Y')), false,
                $html_attr = array('id' => 'year', 'name' => 'year')) ?>
        <br/>
        <input type="submit" />
    </form>
</div>